package com.ggz.es.service;

import com.alibaba.fastjson.JSON;
import com.ggz.es.model.Content;
import com.ggz.es.util.HtmlParseUtil;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @version 1.0.0
 * @description: $description
 * @author: ggz
 * @date: 2020-04-19 01:04
 */
@Service
public class ContentService {
    @Autowired
    private RestHighLevelClient restHighLevelClient;

    /**
     * 根据关键字 解析数据存入ES 索引中
     * @param keywords
     * @return
     */
    public Boolean parseContent(String keywords) throws Exception  {
        List<Content> contents = new HtmlParseUtil().parserByKeywords(keywords);
        // 把查询的数据放入 ES 中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");

        for (int i = 0; i < contents.size(); i++) {
            System.out.println(JSON.toJSONString(contents.get(i)));
            bulkRequest.add(new IndexRequest("jd_goods")
                    .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }
        BulkResponse bulkItemResponses = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        return  !bulkItemResponses.hasFailures();
    }

    /**
     *  获取这些数据实例搜索功能
     *
     * @param keywoed
     * @param pageNo
     * @param pageSize
     * @return
     * @throws IOException
     */
    public List<Map<String,Object>> searchPage(String keywoed, int pageNo, int pageSize) throws IOException {
        if (pageNo <= 1){
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        // 分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);
        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title",keywoed);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60,TimeUnit.SECONDS) );

        //构建高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        //多个高亮显示
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);


        //执行搜索
        searchRequest.source(sourceBuilder);
        RequestOptions options;
        SearchResponse searchResponse = restHighLevelClient.search
                (searchRequest, RequestOptions.DEFAULT);

        //解析结果
//        ArrayList<Map<String,Object>> list = new ArrayList<>();
//        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
//            list.add(documentFields.getSourceAsMap());
//        }


        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            //原来的结果
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            // 解析高亮的字段，原来的字段来换为我们高亮的字段即可
            if (title != null){
                Text[] fragments = title.fragments();
                String n_title = "";
                for (Text text : fragments) {
                    n_title += text;
                }
                // 高亮字段替换原来的内容
                sourceAsMap.put("title",n_title);
            }
            list.add(sourceAsMap);
        }
        return list;
    }
}
